Ncert Exercises & Solutions

Question 10.25:

What happens when

(i) sodium metal is dropped in water ?

(ii) sodium metal is heated in free supply of air ?

(iii) sodium peroxide dissolves in water ?

(i) When Na metal is dropped in water, it reacts violently to form sodium hydroxide and hydrogen gas. The chemical equation involved in the reaction is:

2 {Na}_{(s)} + 2 H_{2} O (l) \to 2 {NaOH}_{(aq)} + H_{2 (g)}

(ii) On being heated in air, sodium reacts vigorously with oxygen to form sodium peroxide. The chemical equation involved in the reaction is:

2 {Na}_{(s)} + O_{2 (g)} \to {Na}_{2} O_{2 (g)}

(iii) When sodium peroxide is dissolved in water, it is readily hydrolysed to form sodium hydroxide and water. The chemical equation involved in the reaction is:

{Na}_{2} O_{2 (s)} + 2 H_{2} O_{(l)} \to 2 {NaOH}_{(aq)} + H_{2} O_{2 (aq)}

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